Apologies if I was not clear. If my partner tries to update her calendar or access her Kindle app, access is NOT possible until she re-boots the TP.

Sounds like the device is having issues accessing the data on the device. Remove the kindle account from the device, remove all synergy accounts from the device, restart the device, and put them back in.

Afterwards give it a whirl for a few days.

__________________Try diplomacy first. You can always conquer them later...